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Why does the errors oscillate strongly in my multigrid method?

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Old   October 19, 2009, 03:29
Default Why does the errors oscillate strongly in my multigrid method?
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I am solving a two-dimensional Poisson equation with two-level V-cycle.
However, I observe that my errors and residuals decrease with oscillation. In addition, the convergence is slower than single grid. Can anybody tell me how to detect what is wrong?

Thank you.
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